Control method for high voltage ride-through rotor of doubly-fed wind turbine based on servo algorithm

A technology of wind power generators and doubly-fed generators, which is applied in the field of control of high-voltage ride-through rotors of doubly-fed wind power generators, and can solve the problems of inability to balance equipment costs, prediction accuracy and calculation efficiency, and short processing time

Active Publication Date: 2016-09-07
HEFEI UNIV OF TECH
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Problems solved by technology

[0007] Aiming at the problem that the above-mentioned control method for doubly-fed wind turbines cannot take into account equipment cost, prediction accuracy and calculation efficiency, the present invention proposes a control method for high-voltage ride-through rotors of doubly-fed wind turbines based on the follow-up algorithm, which can control The adaptive differential negative feedback value of the doubly-fed wind turbine under different sudden swell ranges is optimized, so that the results obtained under this method are more accurate, the processing time is shorter, and no additional investment in hardware equipment

Method used

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  • Control method for high voltage ride-through rotor of doubly-fed wind turbine based on servo algorithm
  • Control method for high voltage ride-through rotor of doubly-fed wind turbine based on servo algorithm
  • Control method for high voltage ride-through rotor of doubly-fed wind turbine based on servo algorithm

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] refer to figure 1 , in order to verify the feasibility and effectiveness of this method, the following experimental testing platform was built: a doubly-fed wind power generator, the initial voltage of the stator of the doubly-fed wind power generator is Us=690v, and the initial voltage of the rotor is Ur=220v , speed n=1800r / min. In Example 1, the sudden increase p=0.3, the comparison curves of the fitness of different algorithms are as follows figure 2 As shown, the example steps are as follows:

[0048] Step 1: Collect three-phase current, three-phase voltage, wind turbine speed n and grid voltage surge p from the rotor side of the double-fed wind turbine, where the three-phase current on the rotor side of the double-fed wind turbine is recorded as A phase current i a , B-phase current i b and C-phase current i c ; The three-phase voltage on the rotor side of the doubly-fed wind turbine is denoted as the A-phase voltage u a , B-phase voltage u b and C-phase v...

Embodiment 2

[0078]In Example 2, the maximum number of iterations M is set to 100, and the sudden increase is p=0.1. The comparison curve of the fitness of different algorithms is as follows: Figure 5 As shown, the example steps are as follows:

[0079] Step 1: Collect three-phase current, three-phase voltage, wind turbine speed n and grid voltage surge p from the rotor side of the double-fed wind turbine, where the three-phase current on the rotor side of the double-fed wind turbine is recorded as A phase current i a , B-phase current i b and C-phase current i c ; The three-phase voltage on the rotor side of the doubly-fed wind turbine is denoted as the A-phase voltage u a , B-phase voltage u b and C-phase voltage u c ;

[0080] Step 2: Collect the collected three-phase current A-phase current i on the rotor side of the doubly-fed wind turbine a , B-phase current i b and C-phase current i c Transform from the three-phase stationary coordinate system to the two-phase synchronous...

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Abstract

The invention provides a doubly-fed wind generator high-voltage traversing rotor control method based on a follow-up algorithm aiming at the defects of an existing control method for a doubly-fed wind generator. The high-voltage traversing rotor control method includes the steps that (1), the three-phase current, the three-phase voltage, the rotating speed of the wind driven generator and the swell amplitude of power grid voltage on the rotor side are collected; (2), the collected three-phase current and the three-phase voltage are converted into numerical values in a two-phase synchronous rotating coordinate system; (3), a self-adaptive differential negative feedback value L 'alpha corrected based on the follow-up algorithm is introduced into a current feedback channel on the rotor side; (4), the q-axis voltage component V'rq on the rotor side is obtained through inversion according to the corrected differential negative feedback value L 'alpha; (5), a result of the step (4) is converted into numerical values in the two-phase static coordinate system, and the numerical values are input into a power tube in an inverter module for control. Self-adaptive differential negative feedback values of the doubly-fed wind generator at different rotating speeds and with different swell amplitudes can be optimized, so that the prediction result is more accurate, and the time consumed for processing is shorter.

Description

technical field [0001] The invention belongs to the technical field of doubly-fed wind power generator control, and mainly relates to a control method for high-voltage ride-through rotors of doubly-fed wind power generators based on a servo algorithm. technical background [0002] Nowadays, with the continuous expansion of wind farm scale and wind power generation capacity, the mutual influence between wind farm and grid has been significantly enhanced. When the power grid fails and the wind turbines that make up the wind farm are disconnected from the grid, if the wind turbines cannot provide frequency and voltage support to the grid in the event of a grid failure like conventional energy sources, it may cause serious chain reactions. And seriously affect the stable operation of the power grid. [0003] There are many reasons for the grid voltage surge in the actual wind farm: a single phase-to-ground fault may cause a grid voltage surge, the sudden removal of the wind far...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02J3/38G06F19/00
CPCY02E10/76
Inventor 谢震李雪张兴杨淑英
Owner HEFEI UNIV OF TECH
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